Donor properties of thiohydantoin and pseudothiohydantoin towards cobalt(II) and nickel(II) salts

Abstract

Coordination complexes of the type [CoL₂] X₂ (L = thiohydantoin (thn), pseudothiohydantoin (pthn); X = Cl, Br, I), [Ni(thn)₄] Cl, and [Co(pthn)₆] (ClO₄), have been prepared and characterized by elementary analysis. The sites of bonding in ligands and configuration of the complexes have been determined with the help of physical properties, magnetic data, conductance data, i.r. and electronic spectral studies. The site of bonding in thn is thiocarbonyl sulphur and in pthn carbonyl oxygen. The cobalt halide complexes of thn and pthn are tetrahedral with C_2v symmetry, [Ni(thn)₄] Cl₂ is octahedral with D_4h symmetry and [Co(pthn)₆] (ClO₄), is octahedral with O_h cubic symmetry. All complexes except [Co(pthn)₆] (ClO₄)₂, which is a 1 : 2 electrolyte, are non-conducting.